<cfset myList = apple,pear, ,orange,banana, > in Java

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<cfset myList = apple,pear, ,orange,banana, >
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A good practice is to avoid empty elements if possible. ColdFusion s list-processing functions work differently than do the list-processing functions in most other languages and could present a portability issue.
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Changing a list s delimiters
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What if you suddenly needed to use a semicolon as your list delimiter instead of a comma You would use ListChangeDelims() as follows:
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<cfset myList = ListChangeDelims(myList, ; , , )>
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14 Creating Lists and Arrays
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myList now contains apple;pear;orange;banana . The interesting thing about ListChangeDelims() is that it automatically removes empty elements. Take, for example,
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the following list:
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<cfset myList = apple,pear,,orange,banana, > ListChangeDelims() would return apple;pear;orange;banana . Using ListChangeDelims(), therefore, is also a good way to remove empty elements even if you re
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not changing delimiters, as follows:
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<cfset myList = ListChangeDelims(myList, , , , )>
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Sorting list elements
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The lists that we ve been using in the preceding sections have all been in random order. If you need items in a list to be in a particular order, you can use ListSort(), as follows:
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<cfset myList = ListSort(myList, text , asc )>
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After calling ListSort(), myList would contain the following:
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apple,banana,orange,pear
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As does ListChangeDelims(), ListSort() removes empty elements. The second argument to ListSort() is the type of sort to perform. This argument can take any of the following three values: Numeric: Sorts the list numerically. If any list element cannot be converted to a number, ColdFusion throws an error. Text: Sorts the list alphabetically but is case sensitive. Try calling ListSort() on the following list:
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Pear, apple, Banana, peach
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This call would return the following:
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A case-sensitive sort always returns uppercase letters before lowercase letters; as such, any words in all capital letters would sort before any initial-capped words. Just the fact that a letter is uppercase is enough to guarantee that the letter will come before any lowercase letter. Textnocase: Sorts the list alphabetically, ignoring case. Calling ListSort() on the preceding list would return the following:
apple, Banana, peach, Pear
The third argument to ListSort() can be asc or desc depending on whether you want an ascending or descending sort.
Qualifying list elements
Suppose that you had the following list:
pear, orange, lemon, citron
Part III The ColdFusion MX Language
But suppose, too, that you wanted to use it in a query such as the following:
SELECT * FROM Fruit WHERE FruitName IN ( pear , orange , lemon , citron )
You couldn t just use it as follows:
SELECT * FROM Fruit WHERE FruitName IN (#myList#)
That s because myList doesn t have single quotes around its items, and the database would throw an error when it tried to execute the query. Before using myList in a query, you must qualify the list elements by surrounding them with single quotes. ColdFusion offers a function named ListQualify() to do just that, as the following example shows:
SELECT * FROM Fruit WHERE FruitName IN (#ListQualify(myList, )#)
The second attribute describes the qualifier in this case, a single quote.
Using Arrays
Arrays, as do lists, store multiple values under a single name and have a library of functions built around them. Unlike lists, however, arrays store data in separate compartments and not just as a delimited string. Where lists are simple variables (that is, they are just simple strings with formally defined delimiters), arrays are complex variables, meaning that they may contain more than a single value and create programmatically addressable compartments for those values. An array is an ordered stack of data, as shown in Figure 14-1. Figure 14-1: A visualization of an array.
Creating an array
Unlike a list, which is a simple string variable, an array is a special type of object that is created by calling a function named ArrayNew() , as follows:
<cfset myArray = ArrayNew(1)> ArrayNew() creates a new, one-dimensional array object and assigns it to the variable
myArray. An array can have up to three dimensions. A one-dimensional array creates a stack of elements such as that shown in Figure 14-1. A two-dimensional array is like a grid of elements, such as that shown in Figure 14-2.